Method of melting oxidizable material



C. TAMA Oct. 13, 1931.

METHOD OF MELTING OXI I )IZABLE MATERIAL Filed June 10, 1929 Inverfir grww Tm,

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crmo run, or nnmaswmn, GERMANY, ASSIGNOIB 'ro mm. mason, nun-ma,

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Application filed June 10, :1829, Serial No.

' oxidizable materialin smal pieces, like waste hole of the furnace.

metal.

It is known to prevent the oxidation of such material before, and during the melting process by various reducing agents. e. g. by a sooting blaze or by inert gases. However, these methods require particular accessory parts,

are expensive in work and not always reliable.

One'object of theinvention is to prevent the oxidation of the melting material without any special m ans in an entirely reliable manner.

Another ob ect is to provide an apparatus for carrying "out the method according to the invention. 7

The invention bases on the fact, that from the melting bath metal vapours escape which may be used for preventing the oxidation of the melting material. The method according to the invention consists in leading the metal vapours escaping from the melting bath through the melting material during the whole melting process so that the melting of the material is efi'ectuated in this non-oxidizing vapouratmosphere; Thereby the oxygen of the air cannot come into contact with the heated melting material and its oxidation is completely prevented in the most simple I n the accompanying drawing there is illustrated an apparatus for carrying out the invention.

The crucible B of refractorymaterial is surrounded by an induction coil A. Above the crucible a conical part C is provided through which the melting material gets inserted into the crucible. The part 0 carries a funnel D and a preheating or condensing room F having a cylindrical form. Between the funnel D and the room F'a erforated plate E is provided the openings 0 which are to be shut by the sliding lid H. G is the tap The method of operation is as follows: First the crucible and the room C get charged with l'neltin material, e. g. brasschips. Then the plate E will be shut bythe sliding lid H, the charge melted by induction 389,653, at in Germany June 1c; 1928.

appears as the whole waste which is to be eliminated by any known means, e. g. by mixing up the chips with a certain amount of pul-. verized coal. Practically any waste of zinc is avoided and it has been found indeed that the melting of brass-chips with this method was efiectuated with an output of 98-99% which result could not be reached by any known method upto the present time.

The irrigation of the charge with the metal vapours has the further advantage of preheating. the charge which is of great importance, especiallywith continuous working.

In order to increase the reliability of servclosed by a safety-valvemay be provided in the room 0 for letting out the excess of zincvapour in case of overheating the melting bath and too strong production of zinc-vapour caused thereby.

It is to be well understood that the invention is not restricted to the melting of brassice an iron pipe leading into free air and chips but relates to the melting of any material containing vaporizable components. The melting process may also be efl'ectuated in any meltmg furnace besides induction furnaces.

Having now described and ascertained the nature of my invention and in what manner the same is to be performed, what I claim is a 1. Inan apparatus for melting oxidizable material, in combination, a melting pot,

means for heating said melting pot, a pre- .95

heating chamber arranged above said melting pot and connected to it bya funnel of refractory material and a erforated plate provided between the meltlng pot and the preheating chamber, the perforated .plate being adapted-to be removed and provided with means for-closing the epenine's of said plate 2.1m an apparatus for melting cxidizahle material, in cemhination, a crucible, an'indnction coil surrounding said crucible a pie heatin chamber arranged alcove sai crucihle an connected to it by a tunnel of refractory material, a perforated plate between the crucible and the preheating chamber, said perforated plate hemg adapted to he removed and provided with means for closing its penings.

which consists in leading metal vapors from a molten bath of said oxidizable metals throughthe metal to be melted to melt said metals and to exclude air. 1

' 4:- A method for preventing tion of oxidizable metals and melting the same, which consists in melting a first charge of oxidizahle metal, and meltlng succeeding charges of said metal While directing the metal vapors of the revionsly melted metal through said succee 'ng'charges to melt the e same and to exclude air.

In testimony whereofll afix my si nature. CYRANG '11 MA.

eanna 3. A method for preventing the oxidation of oxidiza'ble metals and melting the same,

the (mat- 

